RU2085314C1 - Shape bending mill - Google Patents

Abstract

FIELD: plastic metal working, namely manufacture of relatively small bent bars. SUBSTANCE: shape bending mill with cantilever mounting of rolls includes upper and lower chocks arranged with gap and vertical rollers mounted in pairs on axles. In foundation of mill L-shaped strut is mounted. Grooved guides are secured to said strut by their one ends. In grooves of said guides carriages are placed. Said carriages support axles of said rollers with possibility of vertical motion. Other ends of said guides are arranged in through different-height grooves made in small vertical face of lower chock. Height of larger groove is more than height of smaller groove by value of allowance range for spacing of horizontal grooves from lower face of chock and by value of gap adjustment between said chock and foundation of mill. One end of roller axle is provided with threaded portion whose length is selected according to predetermined height of roller motion, thickness of said carriage and predetermined outer diameter of thread. EFFECT: enlarged manufacturing possibilities due to providing conditions for making high-quality bent shapes with asymmetrical cross section whose edges are arranged in different levels; possibility of bending up edge portions of strips due to increased rigidity of roller mounting. 3 cl, 3 dwg

Description

 The invention relates to equipment for metal forming and can be used in the production of high-quality bent profiles of relatively small sizes.

 For the production of bent profiles from the initial billet with a thickness of not more than 2 mm and a width of 10 150 mm, light mills are used (Production and use of bent profiles of rolled metal. / Ed. By I.S. Trishevsky, M. Metallurgy, 1975, p. 132, tab. . 16), the design of which can differ significantly from mills of medium and heavy types (V. I. Davydov and M. P. Maksakov. Production of bent thin-walled profiles. M. Metallurgizdat, 1959, p. 27-31). Typically, roll forming mills, in addition to horizontal forming rolls, have vertical rollers in contact with the lateral edges of the forming strip.

 A roll forming mill with successively arranged work stands containing calibrated rolls is known, in which the difference in the height calibers of two adjacent stands does not exceed 0.008 of the distance between these stands (ed. St. USSR N 691226), which does not allow its use at small intercellular distances (200 300 mm )

 A roll forming mill is also known, containing only two driven stands: the first and the last, moreover, the rotation speed of the rolls of the last stand is 1.05 1.35 higher than the first (Japanese application No. 6083725, 05/13/85). The disadvantage of this mill is the impossibility of profiling blanks whose length is less than the distance between the indicated stands.

 The closest analogue to the claimed object is a roll forming mill (USSR patent N 1819171 class. B 21 D 5/14).

This lightweight mill with cantilever mounting of the rolls contains upper and lower pillows-supports mounted on the base, and vertical rollers placed on the axles in the inter-stand spaces with the possibility of lateral movement relative to the profiling direction, and is characterized in that the lower rolls of all stands and the upper ones and the last stand are driven, and the ratio of the diameter of the upper rolls D _in to the diameter of the lower D _n is: D _in D _n 1.35 1.45. A disadvantage of the known mill is the impossibility of changing the position of the vertical rollers in the vertical plane within wide enough limits, which narrows the technological capabilities of the mill and complicates its adjustment, thereby increasing labor costs during profiling.

 The main technical task of the invention is the expansion of the technological capabilities of the roll forming mill and the reduction of labor costs in the production of bent profiles.

To solve this problem, the roll forming mill is equipped with a L-shaped stand mounted on the base, guides fixed at one end to the L-shaped rack, and carriages placed in grooves made in the guides, a through groove of less than h is made in each small vertical face of the lower cushion _n or greater than H _{n of} height, wherein said grooves of opposing small faces of two adjacent pillows are of different heights and other ends of the rails are placed in these grooves, while the axes of the rollers are vertically movable and mounted on carriages.

In addition, the height of the larger groove
H _p = h _p + δ + Δ
where δ is the tolerance field for the distance of the horizontal grooves from the lower edge of the pillow;
D a predetermined amount of regulation of the gap between the cushion and the base of the mill.

At one end of the axes of the rollers, a thread is made in length
lh + s + d,
where h is the specified height of the rollers;
s carriage thickness;
d is the specified external diameter of the thread.

 The essence of the technical solution consists primarily in the fact that each of a pair of vertical rollers can be installed at any given height (including unequal), i.e. contact with the edges of the strip bent at different angles (this is typical for asymmetric profiles).

 In addition, firstly, the length of the axes of the vertical rollers is reduced (due to the "raising" of their racks above the base of the mill) and, therefore, the rigidity of the assembly in the transverse direction is increased, which makes it possible to bend the formable strip with these rollers. Secondly, due to the placement of guide carriage rollers in the grooves of adjacent lower cushions, the intercellular gaps are reduced (i.e., the length of the entire mill is reduced), and the vertical stiffness of the assembly also increases.

 In FIG. 1 shows a diagram of a roll forming mill; in FIG. 2 location of the node of the vertical rollers; in FIG. 3 is a top view of this assembly.

 The mill (Fig. 1) contains working stands 1, each of which consists of upper and lower pillows serving as supports for cantilever rolls 2, vertical rollers 3 are located between the stands and behind the last stand; in front of the mill there is lead-in wiring 4, behind the mill there is an outlet roller table 5 (mill drive is not shown).

 Paired vertical rollers 6 (Fig. 2) are mounted on the axis 7, at the lower ends of which a thread of length l is made, and the axes are screwed into the carriages 8 (Fig. 3), moving in the grooves of the guides 9 with screws 10. Some ends of the guides are attached to L-shaped rack 11 mounted on the base (foundation beam) 12, and the opposite, connected by the transverse 13, enter the different-height grooves 14 of adjacent lower pillows 15 (in the plane of the figure in Fig. 2 a small vertical face), mounted on the base 12 sec clearance (e.g. through gaskets).

Transverse (relative direction of profiling xx) the movement of the rollers 6 is carried out using screws 10; at the required height, the rollers are fixed with nuts 16. Obviously, the minimum thread length on the axes 7:
lh + s + d
with a height of standard nuts 16 equal to half the external diameter of the thread "d", which is recommended for small axial forces.

The height h _{p of the} smallest of the horizontal through grooves of the pillows of the supports is selected so as to provide a running landing guides 9; the second groove has a height H _p greater than the sum of the tolerance field d by the distances h ₁ and h _{2 of the} horizontal surfaces of the grooves from the bottom face x ₀ x _{0 of the} pillows 15 and the specified value D of adjusting the gap between the pillow and the base, which is necessary when setting up the mill .

 Other options for the vertical movement of the axes of the 7 rollers are possible (for example, using hydraulics or electromagnets), as well as a slight increase in the difference in the height of the grooves in the pillows (it should be noted that increasing the height of the groove weakens the strength of the pillow).

 An experimental test of the mill was carried out at a pilot industrial roll bending machine 0.3 1.0 x 20 70 light type scientific and technical center of JSC Magnitogorsk Iron and Steel Works. To this end, the results of the work of the well-known mill (patent N 1819171) and those proposed during profiling of the same assortment were compared.

 The experiments showed that it is impossible to obtain high-quality bent profiles with an asymmetric cross-section in a well-known mill, in which the left and right edges are located at equal molding levels. The assortment of the claimed mill has expanded not only due to these profiles, but also as a result of the possibility of bending the edge elements of the strips with vertical rollers of a more rigid unit (i.e., the number of forming passes has increased). In addition, the setup of the mill was simplified, which lengthened its machine time with a corresponding increase in productivity.

 Comparison of labor costs during profiling (taking into account the cost of each mill, referred to the unit of annual rental) showed that the claimed mill they are lower, on average, by 15% than the known. Thus, the experiments confirmed the acceptability of the technical solution found to fulfill the task and its advantages over the known object.

 An example of a specific implementation.

 The light type mill for profiling a strip billet with a thickness of 0.3 - 1.0 mm and a width of 20 70 mm contains eight stands consisting of upper and lower cushions with cantilever mounting of work rolls with rolling diameters of 133 and 95 mm, respectively.

 In the inter-stand spaces and behind the last stand there are 7 pairs of vertical rollers placed on the axes, the lower ends of which are screwed into carriages with a thickness of s 20 mm. Thread diameter d 30 mm, roller movement height h 28 mm; thread length l h + s + d 78 mm.

Roller carriages move in the grooves of the guides, one ends of which are attached to the L-shaped racks installed on the base of the mill, and the opposite ones enter the different-height horizontal grooves of the adjacent lower pillows of the supports; the difference in the height of the grooves is equal to: d + Δ 0.6 + 2.0 2.6 mm, and their height h _p 20 mm; H _p 22.6 mm.

 The magnitude of the transverse movement of the carriages with 26 mm adjusting screws. Fastening the axes of the rollers in the carriages with the help of nuts with a height of 0.5 d 15 mm, since the axial (vertical) forces acting on the thread are relatively small.

Claims (3)

1. Roll forming mill with cantilever mounting of the rolls, comprising a base, upper and lower, installed with a gap, pillows and vertical rollers located pairwise on the axes in the inter-stand spaces, characterized in that it is equipped with a L-shaped rack mounted on the base, guides, the ends fixed on the L-shaped rack and the carriages placed in the grooves made in the guides, in each small vertical face of the lower pillow there is a through groove of a smaller h _p or a larger H _p height, the aforementioned the grooves of the opposing small faces of two adjacent pillows are of different heights and the other ends of the guides are placed in these grooves, while the axes of the rollers are vertically movable and mounted on carriages. 2. The mill according to claim 1, characterized in that the height of the larger groove
H _p = h _p + δ + Δ,
where δ is the tolerance field for the distance of the horizontal grooves from the bottom edge of the pillow;
Δ is the specified amount of regulation of the gap between the pillow and the base of the mill. 3. The mill according to claim 1, characterized in that at one end of the axes of the rollers a thread is made of length
lh + S + d,
where h is the specified height of the rollers;
S carriage thickness;
d is the specified external diameter of the thread.

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